mirror of https://github.com/saitohirga/WSJT-X.git
45 lines
1.1 KiB
Fortran
45 lines
1.1 KiB
Fortran
subroutine redsync(ss,ntrperiod,ihsym,iz,red)
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! Compute the red curve (approx JT9 sync amplitude).
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! NB: red() is used for real-time display only. A better ccfred() is
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! computed during the decode procedure.
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Parameter (NSMAX=1365)
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real*4 ss(184,NSMAX)
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real*4 red(NSMAX)
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include 'jt9sync.f90'
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lagmax=9
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if(ntrperiod.eq.2) lagmax=5
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if(ntrperiod.eq.5) lagmax=2
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if(ntrperiod.eq.10) lagmax=1
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if(ntrperiod.eq.30) lagmax=1
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do i=1,iz !Loop over frequency range
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smax=0.
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do lag=-lagmax,lagmax !Loop over DT lags
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sig=0.
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do j=1,16
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k=ii2(j)+lag
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if(k.ge.5 .and. k.le.ihsym) then
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sig=sig + ss(k,i) - 0.5*(ss(k-2,i)+ss(k-4,i))
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endif
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enddo
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if(sig.gt.smax) smax=sig
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enddo
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red(i)=smax
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enddo
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call pctile(red,iz,40,xmed)
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if(xmed.le.0.0) xmed=1.0
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red=red/xmed
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smax=0.
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do i=1,iz
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red(i)=0.2*db(red(i))
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smax=max(smax,red(i))
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enddo
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h=10.
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if(smax.gt.h) red=red*(h/smax)
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return
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end subroutine redsync
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